drm/amd/display: Add Missing HPO Stream Encoder Function Hook

[Why]
configure_dp_hpo_throttled_vcp_size() was missing promotion before, but it was covered by
not calling the missing function hook in the old interface hpo_dp_link_encoder->funcs.

Recent refactor replaces with new caller link_hwss->set_throttled_vcp_size
which needs that hook, and that causes null ptr hang.
Signed-off-by: Fangzhi Zuo <Jerry.Zuo@amd.com>
Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/dcn31/dcn31_hpo_dp_stream_encoder.c

@@ -710,6 +710,16 @@ static void dcn31_hpo_dp_stream_enc_read_state(
 	}
 }
 
+static void dcn31_set_hblank_min_symbol_width(
+		struct hpo_dp_stream_encoder *enc,
+		uint16_t width)
+{
+	struct dcn31_hpo_dp_stream_encoder *enc3 = DCN3_1_HPO_DP_STREAM_ENC_FROM_HPO_STREAM_ENC(enc);
+
+	REG_SET(DP_SYM32_ENC_HBLANK_CONTROL, 0,
+			HBLANK_MINIMUM_SYMBOL_WIDTH, width);
+}
+
 static const struct hpo_dp_stream_encoder_funcs dcn30_str_enc_funcs = {
 	.enable_stream = dcn31_hpo_dp_stream_enc_enable_stream,
 	.dp_unblank = dcn31_hpo_dp_stream_enc_dp_unblank,
@@ -725,6 +735,7 @@ static const struct hpo_dp_stream_encoder_funcs dcn30_str_enc_funcs = {
 	.dp_audio_enable = dcn31_hpo_dp_stream_enc_audio_enable,
 	.dp_audio_disable = dcn31_hpo_dp_stream_enc_audio_disable,
 	.read_state = dcn31_hpo_dp_stream_enc_read_state,
+	.set_hblank_min_symbol_width = dcn31_set_hblank_min_symbol_width,
 };
 
 void dcn31_hpo_dp_stream_encoder_construct(

drivers/gpu/drm/amd/display/dc/dcn31/dcn31_hpo_dp_stream_encoder.h

@@ -80,7 +80,8 @@
 	SRI(DP_SYM32_ENC_SDP_GSP_CONTROL11, DP_SYM32_ENC, id),\
 	SRI(DP_SYM32_ENC_SDP_METADATA_PACKET_CONTROL, DP_SYM32_ENC, id),\
 	SRI(DP_SYM32_ENC_SDP_AUDIO_CONTROL0, DP_SYM32_ENC, id),\
-	SRI(DP_SYM32_ENC_VID_CRC_CONTROL, DP_SYM32_ENC, id)
+	SRI(DP_SYM32_ENC_VID_CRC_CONTROL, DP_SYM32_ENC, id), \
+	SRI(DP_SYM32_ENC_HBLANK_CONTROL, DP_SYM32_ENC, id)
 
 #define DCN3_1_HPO_DP_STREAM_ENC_REGS \
 	uint32_t DP_STREAM_MAPPER_CONTROL0;\
@@ -116,7 +117,8 @@
 	uint32_t DP_SYM32_ENC_SDP_GSP_CONTROL11;\
 	uint32_t DP_SYM32_ENC_SDP_METADATA_PACKET_CONTROL;\
 	uint32_t DP_SYM32_ENC_SDP_AUDIO_CONTROL0;\
-	uint32_t DP_SYM32_ENC_VID_CRC_CONTROL
+	uint32_t DP_SYM32_ENC_VID_CRC_CONTROL;\
+	uint32_t DP_SYM32_ENC_HBLANK_CONTROL
 
 
 #define DCN3_1_HPO_DP_STREAM_ENC_MASK_SH_LIST(mask_sh)\
@@ -202,7 +204,8 @@
 	type GSP_SOF_REFERENCE;\
 	type METADATA_PACKET_ENABLE;\
 	type CRC_ENABLE;\
-	type CRC_CONT_MODE_ENABLE
+	type CRC_CONT_MODE_ENABLE;\
+	type HBLANK_MINIMUM_SYMBOL_WIDTH
 
 
 struct dcn31_hpo_dp_stream_encoder_registers {